Unsatisfied dependency expressed through field ‘baseMapper‘；

BUG描述

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'roleServiceImpl': Unsatisfied dependency expressed through field 'baseMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'cn.imyjs.mp.mapper.RoleMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}


在使用mybatis-plus的时候遇到这个报错，出现这个报错的原因主要有以下两点：

BUG解决

1.导入的依赖的问题：
注意在使用spring boot整合mybatis-plus时导入的是如下依赖：

<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.5.1</version>
</dependency>

而不是：

<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>3.5.1</version>
</dependency>

2.注解问题

在mapper文件中的类中加入@Mapper注解

@Mapper
public interface RoleMapper extends BaseMapper<Role> {

}

service接口实现类中加入@Service注解

@Service
public class RoleServiceImpl extends ServiceImpl<RoleMapper, Role> implements RoleService {

}

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